.index{
    width:100%;
    height:85vh;
    background:green;
    margin:0;
    padding:0;
}
.index h1{
    color:#ffffff;
    text-align:center;
    font-size:80px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}